package com.bjsxt.service.impl;

import com.bjsxt.constant.LoginConstant;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.IncorrectResultSizeDataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.security.authentication.AuthenticationServiceException;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;


@Service
public class UserServiceDetailsServiceImpl implements UserDetailsService {
    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        ServletRequestAttributes requestAttributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
        String loginType = requestAttributes.getRequest().getParameter("login_type");
        if(StringUtils.isEmpty(loginType)){
            throw new AuthenticationServiceException("登录类型不能为null");
        }
        UserDetails userDetails = null;
        try {
            String grantType = requestAttributes.getRequest().getParameter("grant_type"); // refresh_token 进行纠正
            if (LoginConstant.REFRESH_TYPE.equals(grantType.toUpperCase())) {
                username = adjustUsername(username, loginType);
            }
            switch (loginType) {
                case LoginConstant.ADMIN_TYPE:
                    userDetails=  loadSysUserByUsername(username);
                    break;
                case LoginConstant.MEMBER_TYPE:
                    userDetails =  loadMemberUserByUsername(username);
                    break;
                default:
                    throw new AuthenticationServiceException("暂不支持的登录方式:" + loginType);
            }
        }catch (IncorrectResultSizeDataAccessException e) { // 我们的用户不存在
            throw new UsernameNotFoundException("用户名" + username + "不存在");
        }
        return userDetails;
    }

    private String adjustUsername(String username, String loginType) {
        if(LoginConstant.ADMIN_TYPE.equals(loginType)){
            return jdbcTemplate.queryForObject(LoginConstant.QUERY_ADMIN_USER_WITH_ID,String.class ,username);
        }
        if(LoginConstant.MEMBER_TYPE.equals(loginType)){
            return jdbcTemplate.queryForObject(LoginConstant.QUERY_MEMBER_USER_WITH_ID,String.class,username);
        }
        return username;
    }

    public UserDetails loadSysUserByUsername(String username){
        //使用用户名查询用户
        return jdbcTemplate.queryForObject(LoginConstant.QUERY_ADMIN_SQL, new RowMapper<User>() {
            @Override
            public User mapRow(ResultSet resultSet, int i) throws SQLException {
                if (resultSet.wasNull()) {
                    throw new UsernameNotFoundException("用户名" + username + "不存在");
                }
                long id = resultSet.getLong("id");// 用户的id
                String password = resultSet.getString("password"); // 用户的密码
                int status = resultSet.getInt("status");
                return new User(   // 3 封装成一个UserDetails对象，返回
                        String.valueOf(id), //使用id->username
                        password,
                        status == 1,
                        true,
                        true,
                        true,
                        getSysUserPermissions(id)
                );
            }
        },username);
    }
    /**
     * // 2 查询这个用户对应的权限
     * 通过用户的id 查询用户的权限
     *
     * @param id
     * @return
     */
    private Collection<? extends GrantedAuthority> getSysUserPermissions(long id) {
        String roleCode = jdbcTemplate.queryForObject(LoginConstant.QUERY_ROLE_CODE_SQL, String.class, id);
        List<String> permissions = null; // 权限的名称
        if(LoginConstant.ADMIN_ROLE_CODE.equals(roleCode)){
            permissions= jdbcTemplate.queryForList(LoginConstant.QUERY_ALL_PERMISSIONS,String.class);
        }else {
            permissions = jdbcTemplate.queryForList(LoginConstant.QUERY_PERMISSION_SQL,String.class,id);
        }
        if(permissions ==null || permissions.isEmpty()){
            return Collections.emptySet();
        }
        return permissions.stream()
                .distinct() //去重
                .map(perm -> new SimpleGrantedAuthority(perm))
                .collect(Collectors.toSet());
    }

    /**
     * 会员的登录
     *
     * @param username
     * @return
     */
    private UserDetails loadMemberUserByUsername(String username) {
        return jdbcTemplate.queryForObject(LoginConstant.QUERY_MEMBER_SQL, new RowMapper<User>() {
            @Override
            public User mapRow(ResultSet ResultSet, int rowNum) throws SQLException {
                if (ResultSet.wasNull()) {
                    throw new UsernameNotFoundException("用户：" + username + "不存在");
                }
                long id = ResultSet.getLong("id"); // 会员的id
                String password = ResultSet.getString("password");// 会员的登录密码
                int status = ResultSet.getInt("status"); // 会员的状态
                return new User(
                        String.valueOf(id),
                        password,
                        status == 1,
                        true,
                        true,
                        true,
                        Arrays.asList(new SimpleGrantedAuthority("ROLE_USER"))
                );
            }
        }, username,username);
    }


}
